<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>计算属性</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="app">
        <p>消息：“{{message}}”</p>
        <p>反转消息：“{{reversedMessage}}”</p>
    </div>
</body>
<script>
    var vm = new Vue({
        el: '#app',
        data: {
            message: 'Hello'
        },
        computed: {
            // 计算属性的 getter
            reversedMessage: function(){
                // 'this'指向vm实例
                return this.message.split('').reverse().join('')
            }
        }
    })
</script>
</html>